Cistern or tank.



R O P W A R G R Aw GISTERH 0R TANK. gPPLIOATION FILED rmsjzs, 1910.

Patented Mar.7,1911.

a Bums-181152: 2.

Q a tu A TTORNE Y 8 A. B. "CRAWFORD.

GISTERN 0H TANK.

APPLIOATION FILED IEB. 2B, 1910.

Patnted Mar. 7, 1911.

a sums-2111mm a.

THE mums PETERS c0. WIIIIINGTON.

GISTERN 0R TANK.

ARTHUR B. CRAWFORD, 0F HASTINGS, NEBRASKA.

Specification of Letters Patent.

Patented Mar. *7, 1911.

Application filed February 28, 1910. Serial No. 546,423.

To all whom it may concern:

Be it known that I, ARTHUR B. CRAWFORD, a citizen of the United States, and a resident of Hastings, in the county of Adams and State of Nebraska, have made certain new and useful Improvements in Gisterns or Tanks, of which the following is a specification.

My invention'is an improvement in cisterns or tanks, and consists in certain novel constructions and combinations of parts, hereinafter described and claimed.

The object of the invention is to produce a tank or cistern of plastic material for holding water under pressure, which will be of su'liicient strength to resist the pressure, which may be easily cleaned, and which will not leak, and will keep the water sweet and pure, and at practically the same temperature regardless of the weather.

Referring to the drawings forming a part hereof, Figure 1 isa side view of the improvement; Fig. 2 is a longitudinal section; Fig. 8 is a similar view with the form in place; Fig. 1 is a section on the line M of Fig. 1; Fig. 5 is an end view of the improvement partly broken away; Fig. 6 is a plan view of the man hole ring and cover; Fig. 7 is a side view of the same; and Fig. 8 is a vertical section ofthe same.

The embodiment of the invention shown in the drawings, consists of a tank or cistern '1, formed of plastic material, the tank being circular in cross section, and having rounded ends as shown at 2. A plurality of metallic rings 3 are embedded in the wall of the tank encircling the same, and elliptical rings 4; are also embedded in the walls, the rings running at right angles to the rings 8..

Near one end is arranged a man hole 5, and adjacent to the manhole, the tank is provided with a transverse vertical partition 6, which however does not extend entirely across the tank, but stops short of the bottom to. form an opening 7, between the two compartments 8 and 9, and the wall is also provided with horizontal reinforcing bars 11.

The manhole is encircled by a ring 12 shown in Figs. 6,-7 and 8, the ring having a plurality of openings 13 in its side wall, and a lateral annular flange 14 at its bottom. A plurality of struts or braces 15 are arranged between the outer wall of the ring and the upper part of the flange, one brace between each pair of openings. The flange let is also provided with openings, arranged in two annular series 16 and 17, the members of the series 16 being at the inner side of the series 17 and of smaller diameter. The ring is provided with a cover 18 for closing the tank, and the cover is secured in place by a plurality of bolts 19, extending through the ring and cover, and engaged by nuts 20, above the cover. As shown in Fig. 3, the ring and cover are circular in form, and the cover is provided with a plurality of openings 21*and 22.

An air pipe 23 extends through one of the openings down alongside the partition, and is provided with an angular portion 24 extending beneath the partition and into the compartment 9 of the tank. A second pipe 25 extends through the other opening of the cover into the compartment 8, and at its upper end is provided with lateral branches 26.

As before stated, the tank is of plastic material, such as concrete, and is molded on a form, consisting of plates 27 riveted at their ends as at 28, and the side edge of each plate is provided with an angular flange 29, which is superposed on the flange of the adjacent plate, and secured thereto by bolts 30. The plates are so arranged that when set up they will form an accurate core for the tank.

The tank is preferably built underground, below the frost line, and may of course be at any desired point, and the piping will lead the water from the branches to the desired point, and the tank may be filled through one of them. As is known, it is extremely diiiicult to make a tank of the character specified, air tight, unless it is finished from the inside. With the form of core shown, it being understood that the plates are sufficiently narrow to pass through the manhole, the tank may be molded, the core removed, and the tank finished from the inside, the workmen passing out at the manhole. The manhole also permits easy cleaning of the tank, at any time, should there be occasion for it. This, however, could only occur from sand or the like entering wit the water.

The tank may be of any desired size, in accordance with the conditions which it is to serve, and one form may be used with an i11- definite number of tanks. All. of the metallic part of the tank is covered with the plastic material, except the upper part of the ring, so that there is no probability of rust, or of water contamination, and consequent iron taste. In a tank six feet in diameter,

the opening below the partition should be about 14 inches, and should never be less than this, in order to permit a man to pass under the same, to the inner compartment.

It will be observed that the air is delivered into the inner compartment, and even if the manhole cover is not absolutely a'ir-' tight, the water will form a seal below the partition. If carefully finished, however, the manhole will be airtight. The cover can be easily removed by unscrewing the nuts, and the ring as shown is entirely embedded except the upper edge thereof.

The arrangement of the reinforcing bars will form a sufficient support for the tank walls, and they are assist-ed by the weight of the earth, in which the tank is placed.

I claim:

1. A cistern or tank of plastic material, substantially cylindrical in form and having rounded ends, substantially circular reinforcing rings arranged transversely and embedded in the walls of the cistern, substantially elliptical rings embedded in the walls, at right angles to the first named rings, said cistern having a manhole near one end, a transverse partition adjacent to the manhole, the lower edge of the partition being spaced apart from the bottom of the cistern, a cover for the manhole, means for detachably securing the cover in place, a feed and delivery pipe passing through the cover, and an air pipe extending through the cover, and passing under the partition.

2. A cistern or tank of plastic material, said tank being substantially cylindrical and having rounded ends, and a manhole near one end, a cover for the manhole, a transverse partition adjacent to the manhole and hav ing an opening at the side remote from the manhole, a feed and delivery pipe passing through the cover, and an air pipe passing through the cover, and through the opening of the partition, and a plurality of reinforcing rings embedded in the walls of the tank.

8. A cistern or tank of plastic material, said tank being substantially cylindrical and having rounded ends, and a manhole near one end, a cover for the manhole, a transverse partition adjacent to the manhole and having an opening at the side remote from the manhole, a feed and delivery pipe passing through the cover, and an air pipe passing through the cover and through the opening of the partition.

A cistern or tank of plastic material substantially cylindrical in form and having closed ends, and a manhole on its upper side near one end, a transverse partition adjacentto the manhole, said partition being cut away at its bottom, av cover for the manhole, .and an air pipe passing through the manhole and under the partition.

ARTHUR B. CRAVFORD.

l Vitnesses N. A. BATTY, Nona Hocn CRAWFORD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Washington, I). C. 

